Paper-stop device for duplicating machines



May 20, 1930. v w. K. MOLL 1,759,200

PAPER STOP DEVICE FOR DUPLICATING MACHINES Fil ed Feb. 18, 1929 2 Sheets-Sheet 1 MOM 7 2% ga v w. K. MOLL fAPER STOP DEVICE FOR DUPLICATING MACHINES May 20, 1930.

Filed Febjls, 1929 v 2 Sheets-Sheet 2 Patented May 20, 1930 UNITED STATES PA ENT caries i WILHELM K. Mom, or c rrcaeo, ILLENOIS, Assrenon TO nrrro, me, or CHICAGO, rumors, A CORPORATION or ILLINOIS IPAPEIR-STOP DEVICE FOR DU'PLIGATING MACHINES Application filed February 1a, 1929. .Serial No. 340,757.

This invention relates to the art of duplicating machines forproducing multiple copies of printed or written matter, and has reference more particularly to machines of 5 this type employing a margin bar equipped with a plurality of spaced stops for arresting and'positioning the lower edge ofthe sheet prior to impressing the .latteron the gelatin bed of the machine. y .10 In Letter Patent No. 1,7 53,442, dated April 8, 1930, I have disclosed a duplicating machine more especially designed for billing operations, and wherein the margin bar of the machine is equipped with front, rear and intermediate stops for efiecting the correct'positioning of the master and copy sheets relatively to the bed prior to the printing operations. In the machine of my aforesaid patent the rearmost stop is a fixed bar at or near mediate stop consists of a group of fingers fast on a shaft underlying the margin bar and operating through slots-in the latter, the fingers being moved into and out of working position at appropriate times by a ratchet on the shaft and a pawl mounted on the platen carriage; and the front or foremost stop consists of a fixed bar on the front edge of the margin bar. Practical experience in the use of the aforesaidmachine has shown that, unless the operator exercises considerable care, the lower edge of a sheet intended to be arrested by the intermediate or rear stop will sometimes catch on and be arrested by the foremost stop.

The primary object'of my present improvement is to eliminate this fault; and this I accomplish through a novel front or foremost stop which is shiftable into andout ofoperaerative position when its useis required. A stillfurther object of the invention has been to provide a very simple and reliable auto- 'matic means for effectingthe shifting of the foremost movable stop at the proper times, so that when it is not needed it will-lie out of the way of sheets designed to cooperate with a stopinrear thereof. 1

. to working position.

the rear edge of the margin bar, the inter tive position relatively to the margin bar and is normally held in inoperative position and is automatically shifted. to and locked in op- The invention, in one practical embodiment thereof, is illustrated in the accompanying drawings, in which Fig. 1 is a top plan view of the machine;

Fig. 2 is an enlarged longitudinal section on the line 2-2 of Fig. 1 through a portion of the bed, the platen carriage, and the margin bar and stopdevices, illustrating an idle position of the front stop and aworking position of the-rotary intermediate stop;

Fig. 3 is a fragmentary section illustrating idle positions of the frontand intermediate stops; c

Fig. 4 is a fragmentary section, illustrating the working position of the front stop ant the means whereby said front stop is shifted 4 In the machine of my aforesaid patent, I have provided power operated means for actuating the platen carriage over the printing bed, as well as an automatic circuit make and break device for the electric motor operated by the swinging movements of the carriage on its hinge toward andfrom the print ingbed. Some of these last-named mechanisms are shown in Fig. 1, but since the present improvement is not concerned therewith, description of such parts is omitted.

Briefly describing those parts of the ma-- chine which immediately cooperate with the subject-matter of the present improvement, 10 designates the usual bed of the duplicating machine that is supported on a suitable upright frame, and 11 designates the usualgelatin apron or band that is movable by the operation of receiving and delivery rollers over'the bed 10. 12 designates the flat margin bar that is located opposite and substantially in the plane of the portion of the gelatin band resting on the bed at the front or receiving end of the latter. One of the side frame plates of the machine is formed ,with laterally extending arms 13. in. and be serves to roll the sheet out on the duplicating band 11 after the yoke frame 18 has been pushed forwardly and downwardly by al-handle 20 thereon. The roll 19 cooperateswith a'spring-pressed paper-gripping roll 21 to! grip the sheet andpositively carry it down onto the duplicating band. At the endiof the w return travel of the carriage the yoke718 is returned to the raised position shownrin Fig.

2 by a spring 22. Mountedfon the carriage 16' isan upwardly and'forwardly inclinedpan 23 that serves to support the sheets as they are positioned on the machine preparatory to impressing them on theduplicating band.

Turningnow to a description of those fea- ..tureswhereln the present invention more particularly resides, the margin bar 12 1S equipped with arear paper sheet stop consisting of an undercut strip 24 mounted on and transversely thereof; this rearmost stop being identical Withthe rearmost stop disclosed in my former patent above identified. J ournaled in a pair of bearing blocks 25 on oppo site sides of and depending from the margin shaft 26 is rotated,'pass through slots 29 in the marginbar 12, as clearly shown in Fig.

bar 12 is a'shaft 26, fast on which 'jis aplu rality of suitably spaced discs 27 each of which is formed with a pair of oppositely dis posed sector-shaped fingers 28 that, as the 1. At, the end ofeachreturn travel of the platen carriage, the shaft 26 is given a partial rotation through the agency of a. ratchet in Figsn2, 3' and 4, and fast. on a shaft 32' wheel 30 on one end'of the shaft 26 and a pawl 31 mounted on the platen carriage. In the instance shown. the ratchet wheel 30 has six teeth spaced sixty-"degrees apart; but, of course, the extent of turning movement im parted by the pawl and ratchet is immaterial to the invention, depending upon the particle.- lar service designed to be performed by the machine... For example, in a' machineemploying but two stops on themargin bar used alternately, the ratchetwheel might have four teeth spaced ninety'degrees apart.

. The slots29 extend at one end to a point near the front of the margin bar 12, as shown journaled in and extending between the forward ends of theblocks 25 is a groupof forward stop fingers 33'directly underlying the forward portions of the slots 29 and designed to play through the latter. The shaft-132m normally urged in a counterclockwise direction by a spring 34Yso as to hold thestop fingers 33 below the upper surface of the margin bar 12, as shown in Figs1-2 and 3. Each of thestop fingers 33 is formedwith a tailpiece 35 that terminates in a cam. 36. the 1113- per-end of the latter bearing on the disc 27.

When the cam 36 is engaged bv the advancing end n'f either of the stop fingers 28, the fingers 33 are rocked upwardly, as clearlv shown in Fig. 4:, .so that the forward ends of the fingers present 'themselves'in the path of the sheet of paper drawn downwardly froln i the pan 23 and serve to arrestthe sheet at that point. r I I I .7

The cycle of operation of the device,- when embodied in a billing'machine of the'characplaten frame 18 in raised position, a master sheet M is slid down oil the pan 23 until its rear edge abuts against and is arrested by the upper stop fingers 28 which at this time are projecting through the slots 29. j The'car-,

riage is then given a forward and back.

stop fingers 33 because the cam 36 is still engaged with a circular portion of thestop finbar .12. This movement hasjnotafiected'the j ger'disc or hub 27. ,A copy sheet marked C is next slid down off the pan 23 until its rear end abuts against the rearmost stop 24:,as shown in Fig. 3. The platen carriagegis thenv again reciprocated, impressingthe copy sheet on the gelatine bed, and nearthe end ofth'e' return movement of the'carriage, the shaft 26 is again stepped forwardly through sixty degrees whichbrings the stops 28 and 33 110.]

the positionsshown in'Fi g. 4, wherein it will .be seen that one of the stop fingers 28 has e gaged with the cam 36 and forced the'front stop fingers 33 upwardly to working position. position wherein its rear edge lies against the 7 forward ends of the stop fingers 33, as shown in Fig. 4, and the carriage is again reciprocated to efiect a second 'printing of the. copy The copy sheet is then shifted to a its sheet, and during the return travel of the car riage the shaft 26 is again stepped forwardly" another sixty degrees, which restores the ile parts tothe positionfshownin Fig. 2, thus completing the cycle. As the cam 36 passes 7' eff thelowe'r stop finger 28, the spring 34 L V iis turning the foremost stops 33 to'the idle posirocks the shaft 32 counterclockwise, thus r6 tion shown in Fig.2; Of course, the oppoi sitely disposed fingers 28 alternate in 'performing the sheet stop function.

Fromythe' foregoing it will be seen that wvhen a sheet is designed to be arrested by either the-rear'sto'p 24: orone of theintermediate stops 28-, the foremost stop 33 is below the top surface of the margin bar12, so.

' that it is impossible that'the sheet should be accidentally caught and arrested by the fore most stop when it is intended to 'be engaged by the intermediate or rear stop.

Iclaim 4 V. ,1 1. In a duplicatingmachine'havi-ng a trav V 70 'ter disclosed 1n my former patent' aforesaid, is as follows. Assuming that the parts are I v I in the. position indicated in Fig. 2, with the f a ed from the platen carriage for raising saideling platen carriage, the combination With a margin bar located opposite one end of the printing bed of the machine, of a shiftable paper stop on the front of said margin bar, a second paper stop on said margin bar in rear of said shiftable stop, means normally holdingsaid shiftable stop out of operative position during the functioning of said second stop, and means actuated from the platen carriage for moving said shiftable stop int-o operative position.

2. In a duplicating machine having a traveling platen carriage, the combination with a slotted margin bar located opposite one end of the printing bed of the machine, of a shiftable paper stop on the front of said margin bar movable through the slot of the latter, a second paper stop on said margin bar in rear of said shiftable stop, a spring normally holding said shiftable stop below the top surface of said margin bar during the functioning of said second stop, and means actuatshiftable stop into operative position.

' 3; In a duplicating machine having a traveling platen carriage, the combination With a margin bar located opposite one end of the printing bed of the machine, of a fixed paper sheet stop on the rear of said margin bar,

shiftable intermediate and front paper sheet stops also mounted on said margin bar, and means actuated from the platen carriage for moving both of said shiftable stops in predetermined sequence into operative position.

4. Ina duplicating machine having a traveling platen carriage, the combination With a margin bar located opposite one end of the printing bed, of a fixed paper sheet stop on the rear of said margin bar, shiftable intermediate and front paper sheet stops also mounted on said margin bar, means actuated from the platen carriage for moving said intermediate stop into and out 01 operative position, a spring normally holding said front stop out of operating position, and means operating synchronously With said intermediate stop 'moving means for moving said front stop into operative position. I

5. In a duplicating machine having a traveling platen carriage, the combination with a slotted margin bar located opposite one end of the printing bed, of a fixed aper sheet stop on the rear of said margin ar, a shaft journaled beneath said margin voar, intermediate stop fingers mounted on said shaft and movable through the slots of said margin bar, a second shaft ournaled beneath the front portion of said margin bar, front 7 stop fingers fast on said second shaft registering With the slots of said margin bar, a

spring normally holding said front stop fingersbelow said margin bar, rear extensions on said front stop fingers lying in the paths of said intermediate stop fingers and periodically actuated by the latter to swing said,

front stop fingers above said margin bar, 7

and means actuated from the. platen carriage for intermittently turning said firstnamed shaft.

' WILI-IELM K. MOLL.

With a margin bar located opposite one end of the printing bed, of. a' fixed paper sheet stop on the rear of said margin bar, shiftable intermediate and front paper sheet stops also mounted on said margin bar, means actuated from the platen carriage for moving said intermediate stop into'and out of operative position, a spring normally" holding said traveling platen carriage, the combination 6. In a duplicating machine having a 

